In Step 2, you are forming solid copper (II) hydroxide from copper nitrate. Firs
ID: 788317 • Letter: I
Question
In Step 2, you are forming solid copper (II) hydroxide from copper nitrate. First, add 30 mL of 3.0M sodium hydroxide to the solution in the Erlenmeyer Flask.Take a stirring rod and place the end about 1 cm into the solution; then tough the end to a 2 cm piece of red litmus paper. If the area of the paper where water is transferred from the rod to the paper turns blue, indicating excess hydroxide ions are present, the proceed with the next step. If not, add another 1 mL of sodium hydroxide solution and test again; repeat until the litmus paper turns blue.
In step two of Experiment 4, you add sodium hydroxide to copper(II) nitrate and use a stirring rod to test if the solution is basic. How do you establish whether the solution is basic? (Explain what else is needed, what observations are made, and what should be observed if the solution is basic).
Explanation / Answer
As we are using litmus paper to test if solution is basic or not so, Litmus paper can only test the excess of hydoxide ion not its concentration.
Following solution is basic when there is excess of hydroxide ion .
Ph paper or litmus paper is also needed to verify the same.
Finally solution will have copper hydroxide + hydroxide ion + nitrate ion
When solution is basic litmus paper turns blue
Blue colored Cupper Hydroxide comes out as precipitate
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